Process for fabricating metal bobbins for automatic looms



Sept. 1, E936. H. JUNGHANS PROCESS FOR FABRICATING METAL BOBBINS FOR AUTOMATIC LOOMS Fild May 17, 1955 Patented Sept. 1, 1936 r UNETE STATES PATENT OFFIQE PROCESS FOR FABRICATING METAL BOB- BINS FOR AUTOMATIC LOOMS Helmut Junghans, Schramberg-Sulgen, Germany Application May 17, 1933, Serial No. 671,572 In Germany May 17, 1932 7 Claims. (01. 29-470) The present invention relates to an improveprovision of improved means for the detachable ment in process for fabricating metal bobbins for connection of the heel end of the bobbin with automatic looms. Metallic bobbins as hitherto the spindle for the purpose of refitting a spent employed for the purpose are usually formed with bobbin.

an enlarged butt or heel end equipped with steel I will now start to describe my invention more 5 rings for the fixation of the bobbin in the shuttle. in detail in connection with the embodiments As the bobbins are frequently changed and acthereof illustrated on the accompa y drawing cordingly struck from and reattached to the shutit bein te ed a d unde stood that the inventles, thus causing each time the holding springs tion is illustrated by, but not limited to the emof the h ttl to lide ov th rings of th b bbin, bodiments thereof so illustrated and described. 10 the latter are subject to excessive wear so that the n h drawing x embodiments of the present idea of using steel rings with a protective coating invention are shown in sectional views, wherein for the prevention of corrosion, when or if the the r l ap f th b b n may b th am bobbin has been dipped into w t or e in throughout, whereas the features or means for contact with steam, is not practical, since such fi in e rings on the same and for ascertaincoating will oon b orn away d t th fricing and securing the correct distance between tion of the springs. Consequently it would be adjacent ring w l vary in the several embodimore reasonable to use rings of incorrodible steel, mentS shown.

which however are difiicult to draw or even cannot F gure 1 is a sectional elevation of a bobbin be drawn at all and possess very little elasticity b y g h invention- 20 so that it will be impossible to mount such rings Figs. 2, 3 and 4 are similar views, but omittin in the usual way on the enlarged heel end of the part of the shank, of modified constructions. bobbin, owing to lack of resiliency, or to forcibly 5 s a e sec ion Of a modified form of cause the same to engage annular grooves in the ring, heel end. Fig. 6 is a sectional elevation of a further modi- 25 According to the present invention this disfic ti m n advantage is overcome by mounting such closed Fig. 7 is a sectional elevation, omitting part of rings with flat sides and of relatively large radial the shank, of a bobbin having a guiding sleeve width on the butt or heel end of the bobbin and fitted inside the bead. securing the same in place by means of annular Figure 1 shows a somewhat conical bobbin 3O beads or the like either formed integral on and with a conical shank A merging into a head B with the enlarged heel end by jolting or pressing of not greatly larger diameter, on which four etc. or formed integral on the outer surface of a rings a are mounted to snugly fit in shallow annuferrule adapted to berigidly connected with the lar grooves produced by pressing the wall of the 'head or heel end of the bobbin. head from within to form parallel external beads As the rings required for this purpose cannot b between which, the said rings are rigidly fixed be drawn but must be made by punching, another on the head at the proper lateral distance apart important advantage may be realized by the from each other. The shank A merges into the present invention. According to the latter the head B through an intermediate conical porrings shall have a predetermined external diamtion d. 40 eter and be of sufiicient width, in radial direc- Figure 2 illustrates a modification of the means tion, to exactly fit immediately about the heel employed for fixing the rings on the head. It end of the bobbin. The conical shank of the will be seen that in this figure, as also in the bobbin is of small diameter compared to the Figures 3, 4, 6 and '7, only the head of the bobbin external diameter of the rings which required the is shown, the shank portion being broken off for 45 head or heel end of the bobbin to be enlarged convenience sake, because the same may be of correspondingly in manufacture when the rings any conventional or known configuration. are of small radial width, or if the bobbin is made In Figure 2 the intermediate beads b of Figure from a tubular blank of the same diameter as 1 are omitted and spacing rings 0 of smaller exthat of the head, a considerable reduction'to the ternal diameter are interposed between adjacent smaller diameter of the shank portion of the rings a, and the two end rings a are anchored by bobbin is necessary. Considerable difficulties are beads so that the entire set of four rings a and encountered either way, which, however, are at three spacing rings 0 will be firmly connected once avoided by the present invention. with and rigidly secured on the head of the Another object of my invention resides the bobbin,

In Figure 3 the rings a are fitted and secured to the head in a manner similar to that shown in Figure 1, the sole difference therebetween residing in the particular way of producing the beads b' by jolting instead of internal pressure. After the four rings a have been fitted on the head and secured in place by the jolting operation, three spacing rings not shown each consisting or adapted to be composed of two semicircular halves, are inserted into the three spaces between the four rings a whereupon, by way of a pressing operation, the ribs b, thatisthe spaces between the rings a, are equalized to conform to the width of the said spacing rings.

Figure 4 illustrates a modification wherein the four rings a (shown in Figures 1 to 3) and the spacing rings (shown in Figure 2 form an integral unit in the shape of a ferrule or crosschannelled sleeve which may be made by turning on a lathe or by casting and which may be provi'dedwith circular grooves on the inside surface adapted to engage with corresponding annular ribs '6 of the head for fixing purposes as shown.

The rings a are substantially flat on both sides and of great radial width compared with the wire rings heretofore used, but the sides of the rings a may be reduced at the inner periphery, as. shown in Figure 5.

In the modification shown in Figure 6 four rings a are mounted on the enlarged head B of the bobbin and secured in place in the same way as described hereinb'efore with reference to Figure 3, each ring a, being embedded between two adjacent annular beads b preferably produced by a Jolti'n'g operation or a compressing stroke. The lower end of the head is shaped to form a cone 9 the ba'se'end b of which has a diameter only slightly less than that of the contiguous ring a.

It will be readily understood from the foregoing description and the drawing that a bobbin of the construction shown in Fig. 6 can be easily inserted into the resilient holder of. a spindle, since the conical part '5! of the head will press apart the holding springs during the inserting operation and the free ends of the springs will engage, at the end of said operation, in the'space betweenany two adjacent rings a.

dust as the annular ribs b may be produced successively by jolting after the rings a have been in-dividually mounted on the tube head, also the end portion g of the head may be shaped into the desired conical form after the last ring a s been mounted and secured in place, the upper or'base'end 'b 'of thec-one g serving to secure the lowermost ring a I in .place.

-=In tlie modification illustrated in Figure '7 a memoir; 'sleeve is inserted in the head or heel erid of the bobbin so as to snugly fit therein and to project with its reduced inner end It into the stem or shank of the bobbin. The inside diameter'of the inner'end lc'"of the s'leeve is only a little larger thainithe diameter 'of the spindle at this "place so as to form a re'liable guiding means in theopera'ti'onof placing the spent bobbin on the -'s-pindle. The properly inserted sleeve-i is secured in -place preferably by means of the-.last bead b in the rear'or at the-bottom of the lowermost ring a' which it'enga'ges by 'means'of a lip l.

--In'ord'er to give"a'fullunderstanding of the em- 'bodirne'nts shown-in Figures 6 and '7, I will explain the s'aniehereinaftera little more in detail.

Ihe SpEntbObbins removed from the shuttles ai'eplac'ed on the spindles ofa-spooling machine er the like 'in' or der to befilledagain, as usual in the weaving art. Now for the purpose of facilitating the operation of placing the bobbins on i guided thereon when the bobbin is placed on the spindle for the refilling purpose.

Bobbins having a conical heel end or head are in themselves known in the art. It'is, however, a chief object of the present invention to provide bobbins whereof the body is made of a single piece of metal and which may be manufactured by wholesale in a ready, expedient manner, and with the advantage that by the operation of forming the conical slope g the lowermost ring a will at the same time be secured in place by such operation.

Metallic bobbins as hitherto used in connection with automatic weft-replenishing looms are-usually made of very thin sheet metal and, therefore, have a correspondingly large inside width or diameter which is far in excess of the diameter of the spindle on which the spent bobbin is placed for the refilling purpose. As in the operation of placing a bobbin onto and. about the spindle the holding springs of the latter come in contact with the heel end or head of the bobbin, while a comparatively large free space or clearance still exists between the spindle and the inner surface of the bobbin, a certain difficulty prevails in centering the latter properly respecting the said springs and the spindle head or guiding the same accurately so as to thereby avoid all trouble and friction.

As hereinbefore mentioned it is an objectof the present invention to provide improved means for.

facilitating the centering and attaching of the bobbin on the, spindle, by preventingthe inner grooves of the bobbin head corresponding to the external beads, when once the bobbin is really moved onto the spindle while in excessively slanting position, from collision with the top end of the spindle, and further by providing the best possible guidance which, at or towards the end of the attaching operation, will prevent'the bobbin from being laterally displaced by the holding springs of the spindle adapted to grip the head of the bobbin, so as to maintain a substantially coaxial relationship as regards the bobbin and the spindle. To this end the present invention provides preferably a sleeve adapted to snugly fit in the head of the bobbin so as to overlie the inner grooves of the head and project with its inner reduced end into the slightly conical shank of the bobbin. It will be seen that the reduced end of the sleeve constitutes a reliable guiding means in the operation of positioning the bobbin on and about the spindle, the sleeve being secured in place by the lowermost rib of the bobbin head as hereinbefore described with reference to Figure 6. Obviously the guiding means realized by the provision of the said sleeve, will be-eifective even at .a time when the holding springs have not come in contact as yet with the head of the bobbin. In the subsequent further movement of thebobbin to its final or working position on the spindle the former is'properly guided and centered so as to occupy its; place on the enlarged portion or head of the spindle, in correct position, that is, coaxially with the spindle.

Usually there is a conical portion d between the head and the tubular stem or shank of the bobbin and the sleeve is correspondingly shaped to form an analogous intermediate conical portion 11 adapted to fit snugly in the former. Further the reduced inner end of the sleeve may be provided with an external annular rim k which will assist in centering the sleeve with the aid of said intermediate conical portion, when the sleeve is inserted or forced home into the head of the bobbin.

I have herein described and shown several practical embodiments of my present improvements, but it will be apparent that the same are susceptible of embodiment in various other alternative forms and I, therefore, reserve the privilege of resorting to all such legitimate changes as may be fairly embodied within the spirit and scope of the invention claimed.

What I claim is:-

l. A process for fabricating metal bobbins for automatic looms, comprising forming a hollow blank having a shank and a smooth walled head of slightly greater diameter than the shank, forming a bead in the wall of said head at the end remote from the shank, placing on said head against the bead a closed ring of corrosion resisting material, forming a second bead in the wall of said head in front of the ring, placing a second and similar ring on said head against the last made bead, forming a third head in the wall of the head in front of the second ring, and so on until the desired number of rings spaced axially by beads is fixed on the head, said beads being formed in the wall of the head by a compressing stroke.

2. A process for fabricating metal bobbins for automatic looms, comprisng forming a hollow blank having a shank and a smooth walled head of slightly greater diameter than the shank, forming a bead in the wall of said head at the end remote from the shank, placing on said head against the bead a closed fiat sided ring of external diameter corresponding to the full bobbin head diameter, forming a second bead in the wall of said head in front of the ring, placing a second and similar ring on said head against the last made bead, forming a third bead in the wall of the head in front of the second ring, and so on until the desired number of rings spaced axially by beads is fixed on the head, said-beads being formed in the wall of the head by a compressing stroke.

3. A process for fabricating metal bobbins for automatic looms, comprising forming a hollow blank having a shank and a smooth walled head of slightly greater diameter than the shank, forming a bead in the wall of said head at the end remote from the shank, placing on said head against the bead a closed ring of corrosion resisting material, placing a spacing ring of corrosion resisting material and of lesser external diameter than the first mentioned ring on said head adjacent said first-mentioned ring, and placing further rings similar to said first mentioned ring on said head adjacent the spacing ring, said further rings alternating with spacing rings, and forming a further bead in said head to retain said alternatin rings thereon.

4. A process according to claim 3, in which the beads are formed in the wall of the head by a compressing stroke.

5. A process for fabricating metal bobbins for automatic looms, comprising forming a hollow blank having a shank and a smooth walled head of slightly greater diameter than the shank, forming a bead in the wall of said head at the end remote from the shank, placing on said head against the bead a closed ring of corrosion resisting material, forming a second bead in the wall of said head in front of the ring, placing a second and similar ring on said head against the last made bead, forming a third bead in the wall of the head in front of the second ring, and so on until the desired number of rings spaced axially by beads is fixed on the head, the first formed bead being carried out farther toward the periphery of the adjacent ring than the other beads and is then tapered conically towards the end of the head.

6. A process for fabricating metal bobbins for automatic looms, comprising forming a hollow blank having a shank and a smooth walled head of slightly greater diameter than the shank, forming a bead in the wall of said head at the end remote from the shank, placing on said head against the bead a closed ring of corrison resisting material, forming a second bead in the wall of said head in front of the ring, placing a second and similar ring on said head against the last made bead, forming a third bead in the wall of the head in front of the second ring, and so on until the desired number of rings spaced axially by beads is fixed on the head, said beads being formed by mechanical pressure exerted outwardly against the internal wall of said head and adjacent beads being spaced apart a distance equal to the Width of the ring therebetween.

'7. A process for fabricating metal bobbins for automatic looms, comprising forming a hollow blank having a shank and a smooth walled head of slightly greater diameter than the shank, forming a bead in the wall of said head at the end remote from the shank, placing on said head against the bead a closed flat sided ring of external diameter corresponding to the full bobbin head diameter, forming a second head in the wall of said head in front of the ring, placing a second and similar ring on said head against the last made bead, forming a third bead in the wall of the head in front of the second ring, and so on until the desired number of rings spaced axially by beads is fixed on the head, said beads being formed by mechanical pressure exerted outwardly 60 

